First published in the UK by Hodder and Stoughton in
1965, and priced at three shillings and six-pence, this was later re-printed in the
1994 by Titan Books (cover below).

From the back of the first UK edition:

CAST: John Steed, Emma
Peel, facing ruthless criminals dedicated to the destruction of their own
country - and unidentified.
LOCATION: Fleet Street, and a disused airfield in the Midlands.
DEADLINE: The day after tomorrow...

Patrick Macnee stars in the ABC
television series The Avengers, on whose theme this novel is based. He has
two children, is twice-married, drives Jaguars and designs his own clothes; an
Old Etonian and a descendant of Robin Hood, he was born of aristocratic stock,
has dark brown hair, hazel eyes, and is 6'1" tall."

Deadline: First UK edition

Deadline: Titan reprint

OTHER EDITIONS

Deadline: Portuguese edition

Deadline was published in Portugal in 1967 as Os Vingadores: O Dia Depois De
Amanha by Dêagá. The translator was M. M. Ferreira da Silva

REVIEW

This, along with its companion Dead Duck, is the best in Avengers
fiction. The feel of these two books is very much in keeping with the feel
of the show - especially Dead Duck, but more on that anon. This was
written by Patrick Macnee (who played Steed in The Avengers and Sir Dennis Eton
Hogg in This Is Spinal Tap) and some geezer called Peter Leslie, who probably
filled in on words, plot and typing. Look for The Avengers logo on this
copy. Not there, is it. Selling point was old Pat himself. There was apparently a hardback version of this released in the 60s as well
which I've never seen, but if anybody has one I'd love to know. I suspect
that having seen a paperback copy of 'Reptilicus' turned into a hardback by the
inclusion of cardboard by some enterprising librarian, this may be the case.